2.6.3- Meiosis

• Meiosis is the process of cell division that produces four haploid gametes
• Meiosis has 10:stages:

  • Prophase 1
  • Metaphase 1
  • Anaphase 1
  • Telophase 1
  • Cytokinesis 1
  • P2
  • M2
  • A2
  • T2
  • C2
• Prophase 1:

  • Nucleus membrane breaks down
  • chromatin condenses
  • centrioles produce spindle fibres
  • CROSSING OVER could occur
• Metaphase 1:

  • chromosomes line up at the equator
  • fibres attach to the centromere
• Anaphase 1:

  • Homologous chromosomes are pulled to the side
  • independent assortment can occur (randomly pulled)
• Telophase and cytokinesis 1

  • New nuclear envelopes form
  • Creates genetically identical daughter cells
• Prophase 2:

  • envelope breaks down and new spindles are created
  • however no crossing over occurs here as only sister chromatids remain
• Metaphase 2:

  • chromosomes line up at the centre
  • Fibres attach
• Anaphase 2:

  • Chromatids are pulled to different sides
  • Independent assortment occurs
• Telophase and cytokinesis 2:

  • new nuclear envelopes form
  • cytoplasm divides
  • Products are not genetically identical